Think of the genre that you would like to see a movie from. If you can't even decide that, when you get into the video store walk towards the first genre that you come to.
Once you get to the genre of your choice, pick a letter from A-Z. It really doesn't matter which letter you pick.
Go to the section of movies in that genre that start with that letter. So if you picked B, go to the section of movies that start with the letter B. Most video stores have movies in alphabetical order.
Pick a number between 1-20. Now count the movies in that section until you get to your number. So if you chose 18, you would start in the B section and count from the first movie to the 18th movie. The 18th movie would be the movie that you would rent!
If you are feeling bold, go ahead and rent that movie! If you really have no interest in that movie, pick a different letter and number and try again!